In A Large Bowl, Combine The Chicken, Carrots And Water Chestnuts. In A Small Bowl, Combine The Cornstarch, Water, Soy Sauce And Ginger Until Smooth. Add To Chicken Mixture; Toss To Coat. Position A Wonton Wrapper With One Point Toward You. (Keep Remaining Wrappers Covered With A Damp Paper Towel Until Ready To Use.) Place 1 Teaspoon Of Filling In The Center Of Wrapper. Fold Bottom Corner Over Filling; Fold Sides Toward Center Over Filling. Roll Toward The Remaining Point. Moisten Top Corner With Water; Press To Seal. Repeat With Remaining Wrappers And Filling. Place On Greased Baking Sheets. Combine Butter And Oil; Brush Over Wontons. Bake At 375